F l o r i d a , U S A

Port of Miami Tunnel

All projects
Underground Works
Bouygues Travaux Publics
Customer / concession authority
Florida Department of Transportation
Florida, United States

Design-build of a subsea road tunnel as part of a public-private partnership (PPP)

This twin-tube 4,134-feet-long structure directly links the Port of Miami to the motorway without going through the town center. The project was awarded as part of a Public-Private Partnership (PPP) signed with the Florida Department of Transportation and presented a major challenge: The subsoil was partly composed of highly porous coralline limestone. The TBM was therefore modified during manufacturing to provide two tunneling operating modes: Earth pressure balance and a hybrid mode called Water Control Process. A precursor to the variable density mode, this involves mucking out a hybrid earth pressure balance TBM using a hydraulic process. Prior to tunnel excavation the porous limestone was grouted from a barge to ensure stability during boring.

Another feature of the project: The tunnel is equipped with four massive flood gates weighing more than 61 short tons that can close and hermetically seal the structure within a few minutes in the event of a hurricane.

4,134 ft of tunnel
42 ft of diameter
314,000 cy concrete

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